how to trace channels

Question

i am using nrf52840 sdk 14.2 s140 
 i want to advertise in a single channel and which app is used to trace on which channel is advertising

AndreasF · Accepted Answer

Hi. Bluetooth Low Energy advertises by hopping between three different channels, that is channel 37, 38, and 39. If you want to advertise on a single channel, you simply have to turn off two of the three channels. 
 You can find this in the infocenter here . 
 Example: 
 ble_gap_adv_params_t adv_params;


 adv_params.channel_mask.ch_37_off = 1;
 adv_params.channel_mask.ch_38_off = 1;

- Andreas